Example for exporting to JSON for Edge Labels

Sorry for reposting here after posting to the Google group. I am in a Scrum sprint and am stuck here.

I am trying to export a graph that has labelled edges. The label is of type EffectiveDatedRelationships

case class EffectiveDatedRelationship(hierarchyId: String, edgeType: EdgeType, intervals: IntervalCollection[PlainDate])

IntervalCollection is a class from time4j library. http://www.time4j.net/javadoc-en/

Essentially what I want is to get the list of intervals out of the IntervalCollection and store each pair of start date and end date as an array of tuples (2 element arrays or object) in JSON. For deserialization I will reach each array element and add it to the IntervalCollection object via its plus() method.

The LDi.descriptor method requires a parameter of type L, what should I put as the parameter? I tried to put null and it can run but the intervals element is not exported. I suspect it is because the JSON serialization does not know how to handle this class. How can I define the serialization/deserializaiton logic? I looked at the customSerializer parameter but could not figure out what to do.

Descriptor definition:

import scalax.collection.io.json.descriptor.predefined.LDi
val descriptor = new Descriptor[HierarchyNode](
  defaultNodeDescriptor = portfolioNodeDescriptor,
  defaultEdgeDescriptor = LDi.descriptor[HierarchyNode, EffectiveDatedRelationship](null),
  namedNodeDescriptors  = Seq(rootNodeDescriptor),
  namedEdgeDescriptors  = Seq(LDi.descriptor[HierarchyNode, EffectiveDatedRelationship](null))

def toJson(bundle: PortfolioHierarchyBundle) = {
  bundle.graph.toJson(descriptor)
}

Sample: JSON output: {"nodes":{"RootNodes":[{"id":"dummy"}],"PortfolioNodes":[{"portfolioId":"top1"},{"portfolioId":"parent"},{"portfolioId":"child"},{"portfolioId":"top2"}]},"edges":[{"n1":"dummy","n2":"top1","label":{"hierarchyId":"dummy","edgeType":{"i":0,"name":null},"intervals":{}}},{"n1":"dummy","n2":"top2","label":{"hierarchyId":"dummy","edgeType":{"i":0,"name":null},"intervals":{}}},{"n1":"parent","n2":"child","label":{"hierarchyId":"dummy","edgeType":{"i":0,"name":null},"intervals":{}}},{"n1":"top2","n2":"parent","label":{"hierarchyId":"dummy","edgeType":{"i":0,"name":null},"intervals":{}}},{"n1":"top1","n2":"parent","label":{"hierarchyId":"dummy","edgeType":{"i":0,"name":null},"intervals":{}}}]}

Thanks!

[peter-empen]

I see. You can either a) swith from LDi.descriptor to LEdgeDescriptor or b) often better for other reasons such as type-safety of the lables, switch from LDiEdge to a custom edge. Then please refer to scalax.collection.io.json.TCustomEdge where Transition is a custom edge.

[peter-empen]

Well done!